71253310649 has 2 divisors, whose sum is σ = 71253310650. Its totient is φ = 71253310648.

The previous prime is 71253310631. The next prime is 71253310663. The reversal of 71253310649 is 94601335217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70672500649 + 580810000 = 265843^2 + 24100^2 .

It is a cyclic number.

It is not a de Polignac number, because 71253310649 - 2¹⁶ = 71253245113 is a prime.

It is not a weakly prime, because it can be changed into another prime (71253310679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35626655324 + 35626655325.

It is an arithmetic number, because the mean of its divisors is an integer number (35626655325).

Almost surely, 2^71253310649 is an apocalyptic number.

It is an amenable number.

71253310649 is a deficient number, since it is larger than the sum of its proper divisors (1).

71253310649 is an equidigital number, since it uses as much as digits as its factorization.

71253310649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 71253310649 in words is "seventy-one billion, two hundred fifty-three million, three hundred ten thousand, six hundred forty-nine".